853 document multiple spacecraft scenario

[msuder]

Summary of PR goals.

How to test?

• View the Scenario_Multiple_Spacecraft.md file
• Follow the instructions in that file and verify that everything works as described

Submodule PRs and actions prior to closing this:

• None
  Note: the multiple spacecraft scenario is checkpointed in its own ITC repo here: https://github.com/nasa-itc/nos3-multiple-spacecraft
  This repo is based on the 435 branch here: https://github.com/nasa/nos3/tree/435-42-support-multiple-satellites

Closes #853.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 72.06%. Comparing base (6f2e4a2) to head (fbb4177).
⚠️ Report is 52 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #855      +/-   ##
==========================================
- Coverage   72.75%   72.06%   -0.69%     
==========================================
  Files         761      761              
  Lines       90262    91123     +861     
  Branches     7137     7289     +152     
==========================================
  Hits        65668    65668              
- Misses      24594    25455     +861     

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[Isgaroth-the-Green]

Everything looks good, so approving.

[mattilynwalker]

Might want to add a note regarding the error message after make prep "using duplicate spacecraft config files, changes will not be saved." to be ignored.

[zlynch2]

Might want to add a note regarding the error message after make prep "using duplicate spacecraft config files, changes will not be saved." to be ignored.

Recent changes to 435 branch should fix this. These changes will be rolled into the ITC repo where we are checkpointing the multiple spacecraft config.

[jennifer-opalko]

After knowing to ignore the error message about using duplicate spacecraft config files, everything worked as it should

[zlynch2]

approving. branch works no errors on sc01-sc03. proximity forward works.

changes requested have been pushed to appropriate branches. you can pull the multiple spacecraft branch and verify as well.